Experimental demonstration of square Fresnel zone plate with chiral side lobes.

In this study, we introduce what we believe is a novel holographic optical element called a chiral square Fresnel zone plate (CSFZP). The chirality is imposed on a square Fresnel zone plate (SFZP) using a nonclassical technique by rotating the half-period zones relative to one another. The rotation of the half-period zones, in turn, twists the side lobes of the diffraction pattern without altering the focusing properties inherent to a SFZP. As a consequence, the beam profile is hybrid, consisting of a strong central Gaussian focal spot with gradient force similar to that generated by a lens and twisted side lobes with orbital angular momentum. The optical fields at the focal plane were calculated and found to possess a whirlpool-phase profile and a twisted intensity profile. Analysis of the field variation along the direction of propagation revealed a spiraling phase and amplitude distribution. Poynting vector plot of the fields revealed the presence of angular momentum in the regions of chiral side lobes. The phase of the CSFZPs were displayed on a phase-only reflective spatial light modulator and illuminated using a laser. The intensity patterns recorded in the experiment match the calculated ones, with a strong central focal spot and twisted side lobes. The beam pattern was implemented in an optical trapping experiment and was found to possess particle trapping capabilities.

[1]  Peter G. Kazansky,et al.  Radially polarized optical vortex converter created by femtosecond laser nanostructuring of glass , 2011 .

[2]  Javier Alda,et al.  Diffractive performance of square Fresnel zone plates , 2009 .

[3]  A. Ashkin.  Acceleration and trapping of particles by radiation pressure , 1970 .

[4]  O. Minin,et al.  Parameters Optimization Algorithm of a New Type of Diffraction Optics Elements , 2005, 2005 5th International Conference on Microwave Electronics: Measurement, Identification, Applications.

[5]  Daomu Zhao,et al.  Square Fresnel zone plate with spiral phase for generating zero axial irradiance. , 2010, Optics letters.

[6]  Marat S. Soskin,et al.  Transverse energy flows in vectorial fields of paraxial beams with singularities , 2007 .

[7]  Daomu Zhao,et al.  Focusing properties of Fresnel zone plates with spiral phase. , 2010, Optics express.

[8]  Igor V. Minin,et al.  Improved zoning rule for designing square Fresnel zone plate lenses , 2007 .

[9]  Anand Vijayakumar,et al.  Conical Fresnel zone lens for optical trapping , 2015, Other Conferences.

[10]  Ulises Ruiz,et al.  Optimum generation of annular vortices using phase diffractive optical elements. , 2015, Optics letters.

[11]  Nirmal K Viswanathan,et al.  Topological structures in the Poynting vector field: an experimental realization. , 2013, Optics letters.

[12]  Kishan Dholakia,et al.  Direct electron-beam writing of continuous spiral phase plates in negative resist with high power efficiency for optical manipulation , 2004 .

[13]  K. Dholakia,et al.  Orbital angular momentum of a high-order Bessel light beam , 2002 .

[14]  Yuri S. Kivshar,et al.  Optical Vortices Folding and Twisting Waves of Light , 2001 .

[15]  J Turunen,et al.  Realization of general nondiffracting beams with computer-generated holograms. , 1989, Journal of the Optical Society of America. A, Optics and image science.

[16]  Kishan Dholakia,et al.  Optical levitation in a Bessel light beam , 2004 .

[17]  Andrew G. White,et al.  Generation of optical phase singularities by computer-generated holograms. , 1992, Optics letters.

[18]  Jack Ng,et al.  Theory of optical trapping by an optical vortex beam. , 2009, Physical review letters.

[19]  Anand Vijayakumar,et al.  Design of multifunctional diffractive optical elements , 2015 .

[20]  S. Drobczyński,et al.  New scanning technique for the optical vortex microscope. , 2012, Applied optics.

[21]  A. Vijayakumar,et al.  Phase-Shifted Fresnel Zone Lenses for Photomixing Generation of Coherent THz Wave , 2012 .

[22]  L J Janicijevic.  Diffraction characteristics of square zone plates , 1982 .

[23]  Ming Liu,et al.  Square optical vortices generated by binary spiral zone plates , 2011 .

[24]  Grover A. Swartzlander,et al.  Trapping of low-index microparticles in an optical vortex , 1998 .

[25]  Noé Jiménez,et al.  Formation of high-order acoustic Bessel beams by spiral diffraction gratings. , 2016, Physical review. E.

[26]  J. Masajada,et al.  Analytical model of the optical vortex microscope. , 2016, Applied optics.

[27]  Shanti Bhattacharya,et al.  Design, fabrication, and evaluation of a multilevel spiral-phase Fresnel zone plate for optical trapping. , 2012, Applied optics.

[28]  Leslie Rusch,et al.  Perfect vortex beam: Fourier transformation of a Bessel beam. , 2015, Optics letters.

[29]  Rokas Drevinskas,et al.  Single beam optical vortex tweezers with tunable orbital angular momentum , 2014 .

[30]  Anand Vijayakumar,et al.  Compact generation of superposed higher-order Bessel beams via composite diffractive optical elements , 2015 .

[31]  A A Friesem,et al.  Holographic axilens: high resolution and long focal depth. , 1991, Optics letters.